COB Process and Application at The Hong Kong Polytechnic University's EIA Stream, Lecture notes of Electronics

An in-depth look into the Chip-on-Board (COB) process and its applications at The Hong Kong Polytechnic University's EIA Stream. Topics covered include COB advantages, process flow, wire bonding, die attach, encapsulation, and various bonding processes. The document also highlights the benefits of using a Wire Wedge Bonder for COB production.

Typology: Lecture notes

2019/2020

Uploaded on 03/26/2020

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EIA Stream, Industrial Centre. The Hong Kong Polytechnic University
Industrial
Design
Mechanical
Design
Electronic
Design
Mechanical Development
Electronic Development
Software
Design
Mechanical
Prototyping
Molding
Design &
Development
Hardware
Prototyping
PCB layout
&
Fabrication
Integration
Test &
Verification
Release for
Production
Product Development Flow
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Industrial Design Mechanical Design Electronic Design

Mechanical Development

Electronic Development

Software Design Mechanical Prototyping Molding Design & Development Hardware Prototyping PCB layout & Fabrication Integration Test & Verification Release for Production Product Development Flow

Final Packing & Shipment Product Production Flow Module Testing Module Testing …… Final Product Test Casing Assembly Main PCBA Assembly & Test

SMT

Process …… COB Process

Bare-Die Assembly

• Wire Bonding (打線接合)

• Tape Automated Bonding

• Flip Chip (覆晶接合)

The advantages of COB

 Better performance due to decreased interconnection

between length and résistance

 Better protection against reverse engineering

 Reduced space and cost

COB Application(2)

Chip On Board Products

COB Process Flow

Aluminum Wire Wedge Bonding

 High throughput

 Fine pitch capability

 Effective bonding area: 8" x 4"

 Individual programmable looping

control

 Intelligent pattern recognition

capability

 BQM system for material bond

ability enhancement

Wire Wedge Bonder

 Manual Bond

 Auto Bond

Bonding Process